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fetch categories/number of items where number of items = 0

Hey,
I'm crafting a SQL query that should return the category names as number of items in the categories (listings.* where listings.category = categories.id). The query works fine when there are items, but when there are 0 items in the category, the category isn't returned.

Code:

select categories.name as name
, count(listings.id) as count
from categories
, listings
where listings.category = categories.id
group
by categories.name